18056838 has 8 divisors (see below), whose sum is σ = 36113688. Its totient is φ = 6018944.

The previous prime is 18056833. The next prime is 18056867. The reversal of 18056838 is 83865081.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

18056838 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 18056796 and 18056805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18056833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1504731 + ... + 1504742.

It is an arithmetic number, because the mean of its divisors is an integer number (4514211).

Almost surely, 2^18056838 is an apocalyptic number.

18056838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18056838 is a wasteful number, since it uses less digits than its factorization.

18056838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3009478.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 18056838 is about 4249.3338301433. Note that the first 3 decimals coincide. The cubic root of 18056838 is about 262.3496971757.

The spelling of 18056838 in words is "eighteen million, fifty-six thousand, eight hundred thirty-eight".